Mitsubishi Electric FRESH MASTER GUF-50RD4 Handbook page 14

(2) Troubleshooting 2: An error code is displayed on the remote controller.
See below for possible remedies when there is an error during test operation and
number is displayed on the remote controller.
Note: The components marked with * are available for GUF-50/100RDH
Error code Error content
0900 Test run
2600 Drain error
2601 Disconnected
water sensor con-
nector
3602 Damper motor
error
4116 Fan motor error
5101 Indoor temperature
sensor error
5102 Liquid pipe temper-
ature sensor error
5103 Gas pipe tempera-
ture sensor error
5104 Outdoor tempera-
ture sensor error
6600 Indoor unit address
setting error
6602 Communication
error (Transmission
processor H/W
error)
Cause
Is the test operation switch of either the
fan, bypass damper, or humidifier sole-
noid valve* turned ON?
Drain water is not properly discharged. The body must be levelly installed.
Is there a leak from the permeable-film
humidifier*?
When no problem is found after check-
ing the above items.
Is the CN4D connector firmly connected? Firmly connect the connector.
Is the relay connector between the
circuit board and water sensor firmly
connected?
When no problem is found after check-
ing the above item.
Is the CNL connector firmly connected? Firmly connect the connector.
Is the connector of the damper motor
section firmly connected?
Does the damper operate when the
damper motor is running?
When no problem is found after check-
ing the above items.
The motor continues to run when the
operation is stopped.
• Are the connectors of each thermistor
firmly connected?
• Is each relay connector firmly con-
nected?
• When no problem is found after
checking the above item.
There are duplicate address settings,
meaning there are indoor units with the
same address.
Any of the transmission cables of the
indoor units, Fresh Master, or outdoor
units was wired, or the polarity was
changed with the power ON.
Specified power supply is not used.
Earth fault in the transmission cable
The setting of the outdoor unit is incorrect. See the service manual of the outdoor unit.
Transmission data was changed due to
noise in the transmission cable line.
Malfunction of a controller for the device
in which the error occurs.
4
Set the test operation switch (SW1-1, 7,
8*) to OFF.
The drain pipe must be installed with a
gradient of more than 1/100.
• Fix the water leak.
• Replace the humidifier element*.
Replace the circuit board.
Firmly connect the connector.
Replace the circuit board.
Firmly connect the connector.
Replace the damper motor if it is not work-
ing.
Replace the circuit board.
Replace the circuit board.
• Firmly connect each connector.
• Firmly connect each connector.
• Replace the circuit board.
Check the addresses of devices in the
system.
Simultaneously turn OFF the power of the
indoor units, Fresh Master, and the outdoor
units, and then, turn them ON again.
Check the power supply.
Check the transmission cable wiring and
shielding.
Inspect the transmission waveform and
noise in the transmission cable line.
If the controller is normal, it is a malfunc-
tion of the circuit board.
─ 14 ─
followed by a 4-digit
CHECK
types only.
Remedy